fix: increase face brightness

[chriswblake]

The face brightness is significantly less than the goggles.
This is because a lot of light is absorbed by the LED guide.

Suggestion 1

Separate the 3 LED panels.
Angle the left and right panels.
Move the middle panel forward.
Reduce the length of the LED Guide.

Suggestion 2

Switch to a flexible LED panel.
Something like this.
https://www.amazon.com/dp/B0CL9WGRW2

[chriswblake]

FYI. I have already tried reducing the panel thickness (mm).
0.2 - Not printable
0.4 - Not strong enough and starts warping during print
0.6 - Some warping during printing. Doable but not worth the gain.
0.8 - Prints ok. Slightly brighter, but not obvious.
1.0 - Original design